What is the initial state of the compression process of your car?

if the car used petrol as fuel, then first air will mix with fuel inside the carburetor and then it will allow to go inside the engine cylinder. Inside the engine cylinder, in the first process it will compress the mixture of air and fuel up to 9 to 10 compression ratio. After that heat addition will take place at constant volume and temperature of mixture will increase. After this the mixture will allow to expand inside the cylinder and it will give the power of crank shaft. And the last stage exhaust process take place in which flue gas comes out from cylinder.